How do I make a decent recording from a bad mic?

I’m going to make a small song recording. I have a built-in mic in my laptop. It’s not bad bad. But it’s definitely not a great mic.

What can I do to make the most out of my recording?
Like distance from the mic.
Or being in a small room for better acoustics.

There are two main issues I have.
1 when a sound gets to loud it just not good.
2 it’s just so obvious it’s a recording. I’d like it to sound more like I’m there.

Without buying a new mic, what are some adjustments I can make just to make a recording a little bit nicer.